Premium, ad-free logic-grid deduction puzzles where every answer is provably forced — and the game shows you why.
Read the clues, rule out what cannot be, and prove what must be. Every GRIDIGMA puzzle is verified by a solver that shows the reasoning behind each step, so a solution is never a guess. Free to play in your browser, with a new puzzle every day.
202 puzzles and counting — a new one every day
Logic grid puzzles: how to solve them, with a worked example